I need some pointers on how to implement a system with 1->many
relationship between the objects.
Let's say we have a grid of blog posts which we instantiate with a
grid widget:
(make-instance 'gridedit
:name 'posts-grid
:data-class 'post
..........................
:view 'post-table-view
:item-data-view 'post-data-view
:item-form-view 'post-form-view))
When we drill into a "post" item, we'll get presented with post-form-
view which uses post class as scaffolding:
(defview post-form-view (:type form :inherit-from '(:scaffold
post)) ....)
Now I want to add "replies" to the post so that post class would look
something like
(defclass post ()
((id)
......
......
(replies :accessor post-replies
:initarg nil
:initform nil
:type post ;;(or some other type)
:documentation "replies to the post")))
How do I add the ability for post-form-view to add/delete the replies?
I tried extending post-form-view to look like
(defview reply-table-view (:type table :inherit-from '(:scaffold
post))
(id :hidep t))
(defview post-form-view (:type form :inherit-from '(:scaffold post))
......
(replies:type mixin :view 'reply-table-view))
But this doesn't work giving an error that some function is nil (which
is really hard to say which function is missing and where from looking
at the debug output).
Looks like I am missing something in understanding of how views work.
Please, nudge me in right direction.
In general, I am looking for a generic method of creating a tree of
persistent objects using views
(something like root->obj_level1_1
obj_level1_2
obj_level1_3->obj_level2_1
obj_level2_2
.................
obj_level2_N
.................
obj_level1_M
I specified two levels here (like posts->replies) but in general there
could be any number of levels)
Thank you,
Andrei
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